Printing on textile pabrics



Patented Aug. 9, 1932 UNITED STATES PATENT OFFICE m ALBERT KUNZ, MANNHEIM, AND FRITZ TELLEB, OF LUDWIGSEAFEN-ON-THE- BHINE, GERMANY, ASSIGNORS TO GENERAL ANILINE WORKS, INC., OF NEW YORK,

N. Y, A OOBPOBATION OF DELAWARE PRINTING ON TEXTILE FABRICS No Drawing. Application filed April 26, 1928, Serial No. 273,147, and in Germany Kay 23, 1927.

This invention relates to improvements in printing on textile fabrics.

The use of vegetable mucilages for thickening the printing color is already known in the art of printin on textile fabrics. Generally s eaking, however, their sphere of application is restricted to neutral or acid printing colors, their employment in association with alkaline color preparations in particular with the valuable vat dyestuffs being precluded because many of these mucilages coagulate in strongly alkaline printing pastes.

We have now found'that precisely the same vegetables mucilages possessing the aforesaid pro erties are nevertheless excellently adapted or printing on textile fabrics with dyestuffs requiring alkali to fix them on the fibre, especially vat dyestuii's. Accordin to go the present invention the textile fabric is rst srinted with a printing paste comprising the yestufi and either alone or mixed with other thickening agents, vegetable mucilages, or reparations of the same, which are coaguable by alkali or other basic agents, the said printing colors containing no alkali or only an amount insufficient for coagulation and fixation, and containing, or not, reducing agents. The impression thus obtained is then fixed on the fibre in a bath containing an alkaline agent and, if required, reducing agents, with or without steaming. When operating without steaming, the prints may be fixed by treatment in a hot developing bath rendered strongly alkaline by caustic alkali.

The process herein described would not furnish satisfactory results with thickenings made from starch paste, because, in these cases, the colors have a tendency more or less to run. The property of many vegetable 'mucilages, such for example of that from carob seed, of being coagulated by sufliciently strong alkali, is, however, precisely that which enables very sharp prints to be obtained.

Since the coagulation of the thickening does not occur unless the paste contains a certain concentration of alkali, the carob 50 seed meal, for example, may be boiled, at the commencement, in the presence of very small quantities of alkali, this method being advantageous for increasing the viscosity and 1m arting better printing properties and sta ility to the thickenings.

The printing process hereindescribed is of particular importance in connection with hand printing and splash printing with vat and sulfur dyestuffs, since, by reason of the absence of reducing agents, the prints may be left for any desired length of time without the fastness of the print suffering in the subsequent development and steaming.

The following examples will further illustrate the nature of the said invention which however is not limited thereto. The parts are by weight.

. Example 1 9 parts of decorticated, degermed and powdered carob seeds are stirred into a solution of 3 parts of potassium carbonate in 488 parts of water, then heated on the water bath for a quarter of an hour, made up to 500 parts with water, and stirred until cold.

A printing color is prepared from 850 parts of the above thickening, 100 parts of water and parts of indanthrene brilliant violet 2R double paste, fine (Colour Index 1924 No. 1104). The prints obtained with this color are developed, afterdrying, by padding with a bath containing 150 grams of sodium carbonate, 120 grams of sodium formaldehyde sulfoxylate and 50 grains of glycerol per liter, and are dried, steamed in the usual way and finished.

Example 2 35 parts of powdered salep bulbs are stirred up in 1000 parts of water and the mixture converted into a thick mucilage by warming for A hour on the water bath.

A printing paste is produced in the ordinary manner from 950 parts of this thickening agent and 50 parts of indanthrene blue GCD double paste, fine (Colour Index 1924 No. 1113), and the prints produced with this paste are dried and then passed through a developing bath which contains per liter of water 50 com. of sodium hydroxid solution (36 B.), 50 grams of sodium aluminate,

100 grams of sodium formaldehyde sulfoxupon adde After drying the prints are fixed y a short treatment in sodium hydroxid solution of 20 to B. and having a temperature of about 80 C. and are thereupon washed, cleaned and finished in the ordinary manner.

What we claim is 1. The process for printin with vat dye stufis on textile fabrics whic are not deleteriously affected by alkali'es which comprises printing the fabric with a printing paste comprising a vat dyestuff and as a thickening agent a vegetable mucilage capable of being coagulated by basic agents, and then fixing the vat dyestuif on the printed parts by treating the fabric in the presence of a reducmg agent in a bath comprising an alkaline agent.

2. The process for printing with vat dyestufis on textile fabrics which are not deleteriously affected by alkalies which comprises printing the fabric with a printing paste comprising a vat d estufl and as a thickening agent a vegetab e mucilage capable of being coagulated by basic agents, and then fixing the vat dyestufi' on the rinted parts by treatin the fabric in a bat comprising an alka ine agent and a reducing agent.

3. The process for printin with vat dyestuffs on textile fabrics whic are not deleteriously affected by alkalies which comprises printing the fabric with a printing paste comprising a vat dyestufl', as a thickening agent a vegetable mucilage capable of being coagulated by basic agents, together with an amount of alkali insufiicient for coagulation and fixation, and then fixing the vat dyestufi' on the printed parts by treating the fabric in the presence of a reducing agent in a bath comprising an alkaline a ent.

4. The process for printing wit vat dyestuffs on textile fabrics which are not deleteriously affected by alkalies which comprises printing the fabric with a printing paste comprising a vat dyestuff, as a thickenmg agent a vegetable mucilage capable of being coagulated by basic agents, together with an amount of alkali insufficient for coagula'tion and fixation, and then fixing the vat dyestufl' on the printed parts by treating the fabric in a bath comprlsing an alkaline agent and a reducing agent.

5. The process for printing with vat dyestufi's on textile fabrics which are not deleteriously affected by alkalies which comprises printing the fabric with a printing paste comprislng a vat dyestuff, as a thickening agent a vegetable mucilage capable of being coagulated by basic agents, together with a reducing agent, and then fixing the vat dyestuff on the printed parts by treating the fabric in a bath comprising an alkaline agent.

6. The process for printing with vat dyestuffs on textile fabrics which are not deleteriously affected by alkalies which comprises printing the fabric with a printing paste comprlslng a vat dyestufi, as a thickening agent a vegetable mucilage capable of being coagulated by basic agents, together with a. reducing agent, and then fixing the vat dyestufi on the printed parts by treating the fab- 'ric in a bath comprising an alkaline agent and a reducing agent.

7. The process for printing with vat dyestuffs on textile fabrics which are not deleteriously affected by alkalies which comprises printingv the fabric with a printing paste comprising a vat dyestufi', as a thickenin agent a vegetable mucilage capable of being coagulated by basic agents, together with an amount of alkali insuflicient for coagulation and fixation and a reducing agent, and then fixing the vat dyestuff on the rinted parts by treating the fabric in a bath comprising an alkaline agent and a reducing a ent.

8. The process for printing wit vat dyestufis on textile fabrics which are not deleteriously affected by alkalies which comprises printing the fabric with a printing paste comprising a vat dyestufi, as a thickening agent a vegetable mucilage obtainable by heating carob seed with potassium carbonate solution, and then fixing the vat dyestufi on the printed parts by treating the fabric in a bath comprising sodiumcarbonate and sodium formaldehyde sulfoxylate. In testimony whereof we have hereunto set our hands.

MAX ALBERT KUNZ. FRITZ TELLER. 

